I have a 58 3100 and I am getting ready for winter. My heater only blows warm air. I was looking inside the heater box to check the core and found there was not one there, at least I don't think. There are copper tubes running up and down like bars on a cage and they form a square box like frame. When I ran my hand inside to see if they were hot I scraped the back of my hand trying to get out of there because they were good and hot.Was this some kind of heater core from the factory > The dash control is for a deluxe heater.